Wire drawing die blank and method of making same



P. BIEBERICH Dec. 30, 1958 WIRE DRAWING DIE BLANK AND METHOD OF MAKINGSAME Filed May 8, 1953 Fug. 1

PnuL BlEBERMH INVENTOR. B m/ m (QTTORNEY 2,866,364 Patented Dec. 30,1958 WIRE DRAWING DIE BLANK AND METHOD OF MAKING SAME Paul Bieberich,Fort Wayne, Ind.

Application May 8, 1953, Serial No. 353,846

8 Claims. (Cl. 76-107) This invention relates to a wire drawing dieblank and method of making same. More specifically, it relates to a dieof the kind described in which the diamond is rigidly held in place in acentral position in the holder and to a method which permits themanufacture of such a die without damage to the diamond.

Heretofore, one method of forming such a die consisted of forming a seatin each of two plugs, seating the diamond between the plugs andcompressing the plugs toward each other in the holder. This method oftenresulted in shifting of the diamond and also splitting it.

Accordingly, it is an object of the invention to produce an improved diein which the diamond is firmly embedded in a central position.

A further object of the invention is to provide a die in which thematerial forming the receptacle is firmly fixed in the outer ring of theholder.

Another object of the invention is to provide a die in which intimatecontact is obtained between the receptacle and the outer ring of theholder in order to secure good transfer of heat from the stone to theholder.

Yet another object of the invention is to provide a structure and methodwhich will permit the use of aluminum as the material for the holder toobtain a better rate of heat transfer from the diamond.

Still another object is to provide a structure and method which willpermit the folding and compression of the metal or" the receptacle intointimate contact with the entire exterior surface of the diamond andwithout exerting concentrated stresses upon the diamond.

These and other objects will become apparent from a study of thisspecification and the drawings which are attached hereto, made a parthereof and in which:

Figure l is an elevation, partly in section, showing the receptacle,ring and diamond in place under the punch ready to be assembled.

Figure 2 is a cross-sectional view of the die at the end of the pressingoperation.

Figure 3 is a cross-sectional view of the completed die blank.

Figure 4 is a cross-sectional view of the completed die.

Referring first to Figure l, the numeral 1 represents the table or dieblock of the press, 3 the hold-down'element and 5 the punch which ismovable relative to the hold-down element and has preferably a conicalor other recess 7 formed in its end.

Numeral 9 represents the ring of the holder which is provided with acentral, annular recess 11.

The receptacle for the diamond 12 is formed as a cylindrical slug 13having a central counterbore 15 which bottoms in a conical or similarrecess 17. The rim of the receptacle is preferably chamfered at 19 andthe exterior diameter of the receptacle is preferably slightly smallerthan the hole 21 in the ring.

If the ring and receptacle are made of metals such as Monel or bronzewhich require heating before pressing can be accomplished, thisoperation is performed and the parts are disposed on the table 1 inalignment with the punch.

The hold-down member 3 is then brought down on the ring. Since the hole23 in the member and 21 in the ring are substantially the same size, theformer will loosely receive the slug as shown in Figure 1.

Next, the punch 5 is brought down. The edges of the receptacle will becrowded inwardly by the conical recess 7 and bevelled edge 19 andthereafter downwardly, being folded and compressed all around thediamond.

' The receptacle will also be upset so that it will flow radially intoclose contact with the ring and will fill the groove or recess 11. Thisintimate contact is attained between the ring and receptacle and thematerial entering the recess 11 prevents relative axial movement of thereceptacle and the ring.

At the end of the stroke of the punch, the ring and other parts occupysubstantially the form shown in Figure 2. This blank is then machined at25 to the shape shown in Figure 3, after which it is drilled and lappedinto the finished form shown in Figure 4. 1

In the event a material such as a commercially pure, soft aluminum, suchas a stress or impact aluminum, such as grade 28 is used, thecompression step may be performed without heating the ring andreceptacle.

' I have found that the aluminum forms a very good material for holdingthe diamond since it deforms readily and firmly and evenly contacts theentire surface of the diamond. Further, it is an extremely goodconductor of heat so that reduces the deterioration of the diamond andpermits high draw rates.

I have found that the diamonds mounted by my new method are seldombroken and that there is little shifting of the stone from its centralposition in the cavity 17.

While I have shown the recess 7 in the punch and the depression 17 to beconical, they may of course be spherical, parabolic or any othersuitable configuration desired.

It is obvious that various changes may be made in the form, structureand arrangement of parts without departing from the spirit of theinvention. Accordingly, applicant does not desire to be limited to thespecific embodiment disclosed herein primarily for purposes ofillustration; but instead, he desires protection falling fairly withinthe scope of the appended claims.

What I claim to be new and desire to protect by Letters Patent of theUnited States is:

1. The method of forming a diamond die blank comprising the steps offorming a ring having a through bore, forming a receptacle having abottom and a cylindrical wall which is thin relative to its diameter, adepression formed in the interior surface of the bottom to receive adiamond, the end of the receptacle wall being externally chamfered,inserting a diamond in the depression and the receptacle in the bore,folding the wall inwardly and compressing it downwardly by means of apunch having an end recess adapted to fit over and around the chamferedwall, to force the metal of the receptacle into intimate contact withthe bore and with substantially the entire surface of the diamond.

2. A diamond die blank comprising a ring of tough, strong material,having wall means initially defining a central hole, a receptacle ofpure soft aluminum having a closed bottom and a cylindrical wall whichis thin relative to the diameter of the receptacle, a diamond disposedwithin the receptacle such that said wall is folded inwardly at the topand downwardly into contact with the diamond, and said wall and bottomare axially compressed into intimate contact with substantially theentire surface of the diamond and expanded radially into intimatecontact with said wall.

3. A diamond die blank comprising initially, a holder defining acylindrical through hole, a receptacle disposed within and fittingslidably in said hole, said receptacle initially comprising a bottom anda cylindrical side wall said hole, into which recess, a portion of, saidreceptacleextends after compression.

5. Thestructure defined by claim 3 in which the interior of the bottomof said receptacle initially defines a.

central depression to receive and:center said diamond.

6. The structure defined by claim 3 in which the open end of saidsidewall isexternally'chamfered, initially to promote the inward foldingthereof under compression.

7. The method of forming a diamond die blank comprising the steps offorming a ring having athrough bore, forming a metal receptacle having abottom and a cylindrical wall which isthin relative to its diameter,forming a depression in said bottom to receive a diamond, placing adiamond in said depression and the receptacle in said bore, folding thefree end of said wall inwardly and corn-' pressing said receptacleaxially to force the metal of the receptacle into intimate contact withsubstantially the entire surface of the diamond and to expand thereceptacle radially into intimatecontact with said ring.

8. The methodof forminga, diamond dieblank com-.

prising the steps offorming a-ring having a through bore and, a recessinthe bore,- forming a metal receptacle having a bottom and having acylindrical wall which is thin relative to its diameter, forming adepression centrally in said bottom to receive and center the diamond,placing a diamond in the depression and the receptacle in the bore,folding the free end of said wall inwardly and compressing said wall andbottom axially to force the metal of the receptacle into intimatecontact with substantially the entire surface of the.diamond, and withthe surfaces of the bore and recess defined by said ring.

References Cited in the file of this patent UNITED STATES PATENTS486,084" Clausnitzer Nov. 15, 1892 529,611 Dittmer Nov. 20, 18941,178,687 Strickland Apr. 11, 1916 1,420,224 Simons June 20, 19221,543,683 Simons June 30, 1925 1,910,198 Bradley et al. May 23, 19331,926,330 Cotton Sept. 12, 1933 2,171,323 Wyland- Aug. 29, 19392,212,394 Engle et'al. Aug. 20, 1940'v 2,236,288 Engle et al. Mar. 25,1941 2,239,425 Jacobson Apr. 22, 1941 2,277,338 Luginbill etal; Mar. 24,1942 2,328,794 Perrier Sept. 7, 1943 2,363,406 Ferrier- Nov. 21, 19442,422,612 Borne" June 17, 1947' FOREIGN" PATENTS 763,346 France. Apr,27, 1934 771,687 France Oct. 13,1934

